While the aforementioned announcement isn’t slated to arrive until Thursday, Downey took to social media again today to promote his and Marvel Studios’ involvement in a promotion for Julia’s House, a children’s hospice charity.

In a video posted on YouTube, the actor promises one lucky winner the “best night of your life. On Earth. Yet,” with a helicopter ride, indoor skydiving, sharing caviar with RDJ and a walking together down the red carpet for the world premiere of Age of Ultron. There’s a minimum entry donation of $10, and varying levels of donations receive different pieces of Avengers merchandise.